关键词: Lucene, 相似度, 全文检索

Abstract: The scoring algorithm of similarity is one of the core parts in Lucene. After the analysing and researching on the default scoring algorithm of Lucene similarity, this paper proposes an improved algorithm aimed at the deficiency of the Lucene’s default algorithm which only considers the frequencies rather than the position of query terms occurrence. The improved algorithm combines the feature of the terms’ position relationship with Lucene’s default scoring algorithm of similarity. The experiment on the TREC dataset shows that, the improved algorithm increases the value of evaluation metric MAP and P@n to a certain extent.

Key words: Lucene, similarity, full text search